First, Voldemort never harmed a Riddle.
He did kill his family.
True, but irrelevant since they are not subject to the curse:
Before I created you, I invoked a curse upon myself and all other Tom Riddles who would descend from me.
(chapter 112)
He did kill his family.
True, but irrelevant since they are not subject to the curse:
(chapter 112)